Heater



(-3.v BLUEMEL June 14,?!1932.

HEATER Filed Jan. 13. 1930 2 Sheets-Sheet 1 June 14, 1932. G. BLUEMEL HEATER Filed Jan. 13. 1930 2 Sheets-Sheet 2 .um lf o 0 JIM g p ing.

i of Fig. 1.

`m0spheric type Patented .lune i4, 1932 GUSTAV'E '.BLUEMEL, 0F CHICAGO,

CHICAGO, ILLIIOIS, A' CORPORATION 0F ILLINOIS HEATER Application led January 13, 1930. Serial No. 420,545.

This invention relates to heaters for air and other gases and particularly to those in which the air or gas is mixed with products of combustion for use as a heating medium, as in industrial drying and heat treat- The main objects of this invention are to provide an improved form of heater for alr and gases that are propelled or drawn along by a blower or the like whereby the flow of such air or gas is utilized for inducing a `iiow of products of combustion through a burner forming a part of said heater; to provide improved means for controlling the proportions of the products of combustion to the air or other gas to be heated; to provide a device of this kind which may be readily connected into an air or gas duct s o as to form a part thereof and utilize the current of air through said duct regardless of the position of the blower with respect to said heater; to provide a heater of this kind which is universally adaptable either as a pull through or push through type, and which may utilize fluid fuel burners either of the atmospheric'pressure type or high pressure lnspirator type; and to provide improved means for controlling the suction for inducing 4the flow of products of combustion and for preventing back pressure on the combustion chamber.

A specific embodiment of this invention is illustrated in the accompanying drawings, in which:

Figure 1 is a longitudinal section of the improved heater equipped with a burner of the atmospheric pressure type.

Fig. 2 is a side elevation of the'same.

Fig. 3 is an'end elevation viewed from the right of Fig. 1.l

Fig. 4 is a section taken on the line 4--4 Fig. 5 is a' the relationship between the the combustion device.

In the form shown in the drawings, the heater is shown equipped with a so-called atof burner, namely, one in which the air is taken directly vfrom the atmosphere,

diagrammatic view in s ide eleas in the usual Bunsen burner, but the' outlet 9 from it will be understood that this invention is not limited to any particular type of burner, but is equally applicable to any form of burner and to liquid, gaseous, or powdered fuel employing any of the well-known methods of mixing air and fuel to produce combustion in the combustion chamber and supply the desired quantity of products of combustion for mixture with air or other gas as a heating medium'.A The devlce 1s also universal in itsapplication to the extent that it will operate equally well in any position in which it is connected to .a system of ducts; that is to say, the burner may be located either at the top or at either side or the bottom, as may be desired.

The burner shown comprises a primary mixer 1, having a gas supply'pipe 2 and air inlet 3, and the combustion chamber is supplied With a secondary air inlet 4 in which the gas pilot 5 may be conveniently located. The combustion chamber 6 is formed within an L-shaped fitting 7, lined with irebrick 8 or other suitable refractory material. The outlet 9 of the combustion chamber may be circular and is preferably flared both'internally and externally.'

symmetrically arranged around the outlet end of the combustion chamber -is a tubular housing 10, preferably cylindrical in its interio'r, and the ends of said housing are provided with flanges 11 and 12 for connection with a blower housing or with duct-work, and it will Abe readily understood that a blower or fan might be connected at either end of the housing 10 as the engineer might elect, for the purpose of causing the air orA other .medium that is to be heated to flow through the housing in the direction of the arrows.

The housing comprises an outer supporting shell and a sleeve 13 is mounted to slide longitudinally within the outer shell and shaped to form a Venturi passage concentric with the flared end of the tubular outlet of the combustion chamber. rlhe sleeve 13 has a contracted throat 14 substantially equal to o'r slightly greater-,in diameter than the external diameter of the rim 1,5 of the flared walls of the combustion chamber.

ILLINOIS, ASSIGNOR TO DRYING SYSTEMS, INC., 0F y Venturi sleeve,

` they mix with this air. .o f the combustion chamber and 'bafie become The sleeve 13 may be adjusted by means of an adjusting screw 16 to vary the area of the passage between the throat 14 and the externally dared wall 17 of the combustion chamber. This adj ustment` is accomplished by means of a nut 18, seated in a pocket ina hollow member 19, which is mounted on the housing 10 and is open at the top to provide access to the nut 18. Said open top is closed by a plate or lid 2() which may be screwed into place after the adjustment is made, for any desired set of conditions.

1n order to insure a high degree of effciency in the combustion of the fuel before it mixes with the air at the throat of the a conical mass of refractory material 2l is mounted opposite the outlet end of the combustion chamber Where it will become incandescent and baille the products of combustion so as to cause them to flow annularly outward under the eductive action ofthe air current through the Venturi passage. The bafle 2l is preferably with a concave heat reflecting and' radiating Y surface 22 facing the combustion'chamber 6 and is tapered to approximately a stream line form and mounted in a conical ring 23 carried by spider arms 24 extending to a ring 25 bolted to the housing. The main shell of the housing is surround'- `ed by a rectangular jacket 26 spaced from the walls of the housing, said space being filled with asbestos or any other suitable insulating material 27. The shell 10 and sleeve 13 have registering side openings or slots 28 and 29 respectivel the outlet may be observed. closed against air inflow or gas outflowl by means of a plate of glass 30.

The operation of the device shown is as follows: v A blower 3l (Fig. 5), has its delivery outlet bolted directly to the end of the housing This opening is which is at the left of Figure l or is connectedthereto by a duct, and forces an air current through the housing so as to traverse the throat l14 of the Venturi sleeve as indicated by arrows in Figure 1. It will beyunderstood, however, lthat while thefblower is preferably located at the left of Figure 1, it may. with similar effect be connected to withdraw air at the right, the two types of assembly' bein known in the art as the push-through and pull-through types respectively. Gaseous fuel and air are supplied tothe combustion chamber 6 at its inlet end which is at the bottom of Figure 1, and are burned-in the combustion chamber. The air flowing through the housing and Venturi sleeve attains a high velocity in the throat of the venturi and on expanding produces partial vacuum which draws the products of coinbustion over the rim of the baiile121 where The refractory walls provided through which the flame aty candescent and promote complete combustion. A

Adjustment is made for desired conditions by means of the nut 18 which shifts the sleeve 13 while the operator is observing the flame through the side opening 28.

Although but one specific embodiment of j air current and thereby inducing the iow of products of combustion from said outlet.

2. A heater comprising a combustion chamber having fuel and air inlets and an outlet, housing means providing an air passage sur* rounding said outlet, a sleeve in said passage having a throat for restricting said passage in the vicinity of said outlet, said sleeve being of enlarged sectional area beyond said outlet for producing an expanding air current and thereby inducing the flow of products of com bustion from said outlet, said outlet having a flared mouth opposed to the throat of said sleeve, and means for shifting said sleeve longitudinally to vary the velocity of the air in said throat.

3. A heater comprising a combustion chamber having fuel and air inlets and an outlet, housing means providin an air passage surrounding said outlet, a s eeve in said passage having a throat for restricting said passage in the vicinity of said outlet, said sleeve being of enlarged sectional area beyond said outlet for producing an expanding air current and thereby inducing the ow of products of' combustion from said outlet; anda heat retaining baffle located in line with said outlet. j

` 4. A heater comprising a combustion chamber having fuel and air inlets and an outlet, housing means providing an air passage surrounding said outlet, a sleeve in said passage having a throat for restricting said` passage in the vicinity of said outlet, said sleeve being of enlarged sectional area beyond said outlet for producing an expanding air current` and thereby -inducing the How of products of combustlon from said outlet, and means connected with said housing for causing air to flow through said sleeve.

5. A heater comprising a burner having an let at the end of the other branch, said comva contracted hustion chamber having outwardly ared walls adjacent said outlet, a sleeve surrounding said outlet and having a Venturi gassage therethrough, a housing surroun 'ng said sleeve and forming an air assage for directing a current of air throng i. said Ven-- turi passage, said Venturi passage including throat, and means for shifting said sleeve longitudinally of the outlet branch of said combustion of the. air passage between said throat and iiared outlet.

' passa e,

6. A heater comprising Va gas burner, a combustion chamber-having fuel and air in lets and a ared outlet, housing means providing an air passage surrounding said combustion chamber, an adjustable sleeve in said passage having a'throat for restricting said a heat 'retaining cone opposed to said ared outlet, said cone having an outer shape in 'such relation to the diameter of the fiare of said outlet that a Venturi eiect will be created to cause the withdrawal of the products of combustion from said outlet and their mixing with thetinducing air currents, and means connected with said housing for causing air to flow through said sleeve.

7. A. heater having surrounding walls forming a mixing. chamber for air and products of combustion, a conb having an outlet to said chamber opposite the outlet of the combustion device, said combustion device being formedto provide a Venturi passageway surrounding the out let of said combustion device., and a blower having connections to said Venturi air 4passageway for forcing vair into the mixing chamber and inducing a flow of the products of combustion through said outlet.

Signed at Chicago this 9th day of January,

.GUSTAVE BLUEMEL.

chamber to vary the 4area `ustion device mixing chamber, a refractory member mounted in the mixing I surrounding Walls and said. 

